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This high-limit safety control is a direct drop-in replacement for failed or drifting thermal switches in residential and light commercial HVAC equipment
When you're servicing high-efficiency units like the Lochinvar Knight XL or A
What electrical connection is required
those part numbers are identical and refer to the same Size #05 orifice assembly
we recommend maintaining the original pipe diameter to ensure the BTU rating of the heater is not compromised by gas starvation
Lochinvar & A.O. Smith 100166080 Thermal Switch 322057-301 This high-limit safety control isThe Lochinvar & A. O. Smith 100166080 Thermal Switch is a critical safety component designed for Residential FVIR (Flammable Vapor Ignition Resistant) gas water heaters. As a resettable thermal switch, it monitors the combustion chamber for excessive temperatures or restricted airflowcommon issues in systems with a clogged flame arrestor or inadequate makeup air. This rollout switch acts as a manual reset high limit, preventing gas flow to the burner
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